The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through NHS specialist services or private prescribing. The cost varies significantly depending on whether you access it through the NHS or privately. Private Mounjaro typically costs between £129 and £320 per month, depending on your dose and provider. NHS access is free at point of use, but availability depends on your local integrated care board and specialist weight management services.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Mounjaro Pricing: NHS vs Private Access
Private Mounjaro costs in the UK:
- Starting dose (2.5 mg): approximately £129–£180 per month
- Escalation doses (5–7.5 mg): approximately £160–£220 per month
- Higher doses (10–15 mg): approximately £220–£320 per month
Each Mounjaro KwikPen contains 4 weekly doses (one month's supply). Prices vary between GPhC-registered pharmacies and depend on the prescriber's clinical assessment. NHS access is free for eligible patients referred to tier 3 specialist weight management services, but waiting lists can be substantial in many regions. NICE has approved tirzepatide for NHS use, but regional availability and waiting times vary considerably by integrated care board.
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No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What Affects Mounjaro Cost?
Several factors influence the price you'll pay. Dose escalation is a key factor — you start at 2.5 mg and gradually increase every 4 weeks, so your monthly cost may rise over time. Pharmacy choice affects pricing — private costs differ between providers. Additional consultations may incur separate fees with some private prescribers. NHS costs are covered by the health service if you're eligible and referred through your GP to a specialist service. Our GLP-1 weight loss calculator can help you understand potential dose progression and associated costs.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS use in specialist weight management services (tier 3). However, NHS access depends on your local integrated care board, referral from your GP, and meeting eligibility criteria (BMI 30+ or 27+ with weight-related health conditions). Waiting lists vary significantly by region.
How much is a Mounjaro injection privately?
Private Mounjaro costs approximately £129–£320 per month depending on dose. Starting dose (2.5 mg) is typically £129–£180/month, while maximum dose (15 mg) costs £220–£320/month. Each KwikPen contains 4 weekly injections. Prices vary between GPhC-registered pharmacies.
Do I need a prescription for Mounjaro?
Yes, Mounjaro is prescription-only in the UK. You cannot buy it without a valid prescription from a UK-licensed prescriber. Private prescriptions are issued following an online clinical assessment. NHS prescriptions come through specialist weight management services after GP referral.
Is Mounjaro cheaper than Wegovy?
Pricing varies between providers and doses, but both Mounjaro and Wegovy typically cost £129–£320/month privately. Direct cost comparison depends on your specific dose. Our GLP-1 weight loss calculator and BMI calculator can help you determine eligibility and explore your options with a prescriber.
What's included in the Mounjaro cost?
The price typically covers the KwikPen device (4 weekly doses) and storage instructions. Some private providers include follow-up consultations; others charge separately. NHS costs are fully covered if prescribed through your specialist weight management service.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.